Preacher Curl
Primary
Biceps
Secondary
Brachialis, Forearms
Equipment
Ez Bar
Difficulty
Intermediate
Type
Pull
NASM-CPT, CSCS certified trainers. Every guide is built from peer-reviewed research and real coaching experience.
The preacher curl locks your upper arms against a pad, eliminating all momentum and forcing your biceps to do 100% of the work. This strict isolation emphasizes the stretched position at the bottom of the curl, where your biceps are most vulnerable but also most stimulated. The shoulder-forward position targets the short head of the biceps.
Never fully lock out your elbows at the bottom—stop just short of full extension to protect your tendons. On the way up, think about driving your pinkies toward your shoulders rather than just bending your elbows. This cue maximizes bicep contraction.
Preacher Curl — targeted muscles
Why This Exercise Works
The preacher curl is biomechanically unique because the angled pad locks your upper arms in a forward (shoulder-flexed) position, which changes which part of the biceps does the most work. With the shoulder flexed, the long head of the biceps is placed at a mechanical disadvantage (shortened), shifting primary emphasis to the short head of the biceps brachii. This makes preacher curls one of the best exercises specifically for short head development and building bicep width.
The pad eliminates all momentum and body English — your upper arms cannot swing, your back cannot arch, and your hips cannot thrust. This forced isolation means the biceps handle 100% of the load through the entire range of motion. EMG studies confirm that preacher curls produce among the highest biceps activation of any curl variation when performed with strict form, as Dr. Brad Schoenfeld has noted in his comprehensive reviews of bicep training research.
The bottom position of the preacher curl deserves special attention. At full extension, the biceps are in a maximally stretched position under load. Research on stretch-mediated hypertrophy — extensively covered by Dr. Mike Israetel — suggests that loading a muscle in its lengthened position produces powerful hypertrophy signals. This is why the bottom of each preacher curl rep is the most productive part, and why slow, controlled eccentrics are critical. However, this stretched position also carries risk: hyperextending the elbow at the bottom can strain the distal biceps tendon.
The brachialis — the muscle underneath the biceps — acts as a significant synergist, particularly during the mid-range of the curl. The brachialis contributes to elbow flexion regardless of forearm position and actually produces more force than the biceps at certain joint angles. The forearm flexors (brachioradialis and wrist flexors) assist throughout.
Grip width and bar type affect emphasis. An EZ-bar with a narrow grip increases short head emphasis. A straight bar with a wider grip shifts more work to the long head. Using dumbbells allows supination during the curl, which further increases bicep peak contraction. Jeff Nippard has recommended preacher curls specifically for lifters looking to maximize the bicep stretch component of their training.
In MySetPlan programs, preacher curls appear as a secondary or tertiary bicep movement, programmed after standing curls for strict isolation work. They are assigned in moderate to high rep ranges (10-15 reps) where the forced strict form prevents ego lifting and maximizes time under tension.
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How do you perform the Preacher Curl?
- 1
Sit at a preacher bench with upper arms resting on the pad.
- 2
Grip an EZ bar or barbell with underhand grip.
- 3
Start with arms extended but not hyperextended.
- 4
Curl the weight up toward your shoulders.
- 5
Squeeze biceps at the top of the movement.
- 6
Lower slowly under control to starting position.
What are the best tips for the Preacher Curl?
Keep your chest against the pad throughout.
Dont let your arms fully lock out at the bottom.
Focus on the stretch at the bottom of each rep.
When to Use the Preacher Curl
Program preacher curls after your primary bilateral curl movement (barbell or EZ-bar). The strict isolation makes them ideal for moderate to high rep ranges (10-15). Use them when you want to eliminate cheating and focus purely on bicep contraction.
What are common Preacher Curl mistakes to avoid?
Hyperextending elbows at bottom - risks injury.
Lifting butt off seat - reduces isolation.
Using too much weight causing swing - defeats purpose of exercise.
Preacher Curl — who it's best for
Intermediate to advanced. Great for focusing on bicep contraction.
How many sets and reps of Preacher Curl should you do?
Recommendation: 3 sets of 10-12 reps. Rest 60 seconds.
Muscle Growth
8-12 reps
Rest 90s-2min
Strength
4-6 reps
Rest 2-3min
Endurance
15-20 reps
Rest 60s
Where to Use in Your Workout
Program after your primary standing curl (barbell or dumbbell curls). The strict isolation makes preacher curls ideal for moderate to high reps where form matters most. Use as a second or third bicep exercise in your arm session.
Sample Workout Blocks
Hypertrophy: 3x10-12 @ RPE 7-8 (60s rest) | Volume: 3x12-15 @ RPE 7 (45s rest) | Focus on slow eccentrics (3 seconds down) for maximum stretch stimulus
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Get Your Custom PlanWhat are good alternatives to the Preacher Curl?
Concentration Curl
Spider Curl
Machine Preacher Curl
Other Variations
- Dumbbell Preacher Curl
- Cable Preacher Curl
- Single Arm Preacher Curl
Variation Details
Dumbbell Preacher Curl
One arm at a time with a dumbbell. Allows supination for maximum bicep peak contraction and fixes left-right imbalances.
Cable Preacher Curl
Cable maintains constant tension including at the top where dumbbells lose resistance. Excellent for continuous time under tension.
EZ Bar Preacher Curl
Angled grip reduces wrist strain. The most joint-friendly barbell preacher variation for heavy sets.
Single Arm Preacher Curl
Isolate each arm independently. Useful for fixing strength imbalances and improving mind-muscle connection.
Preacher Curl vs Other Exercises
vs Barbell Curl
Barbell curls allow heavier weight and some controlled body English for overload. Preacher curls eliminate all momentum for pure isolation. Use barbell curls for heavy strength work, preacher curls for strict hypertrophy and stretch-focused training.
Incline curls stretch the long head by placing the arm behind the body. Preacher curls emphasize the short head with the arm in front of the body. Both are stretch-focused exercises — use incline for long head, preacher for short head to develop complete biceps.
vs Spider Curl
Spider curls (chest against an incline pad) emphasize the contracted position at the top. Preacher curls emphasize the stretched position at the bottom. They complement each other — pair them in the same session for full range of motion coverage.
Frequently Asked Questions About the Preacher Curl
Sit at a preacher bench with your upper arms flat on the pad and armpits snug against the top edge. Grip an EZ-bar with underhand grip. Start with arms extended but not fully locked out. Curl the weight up toward your shoulders, squeezing at the top. Lower slowly under control, stopping just short of full elbow extension at the bottom.
The preacher curl mainly works the biceps brachii, with extra emphasis on the short head due to the arm-forward position. The brachialis (under the biceps) assists significantly. Your forearm flexors also work to maintain grip. The pad eliminates momentum so these muscles handle all the work.
Both are valuable. Barbell curls let you go heavier and allow some controlled momentum for overload. Preacher curls force strict isolation and emphasize the stretched position for hypertrophy. Use barbell curls early in your workout for strength, preacher curls later for targeted muscle building.
You are likely hyperextending your elbows at the bottom under load. Never fully lock out on preacher curls. Stop just short of full extension to protect the distal biceps tendon. Use a lighter weight and focus on controlling the descent. If pain persists, switch to a dumbbell version for a more natural arm path.
EZ-bars are better for most people. The angled grip reduces wrist strain and is more comfortable during the deep stretch at the bottom. Straight bars increase supination and may produce slightly more bicep peak activation, but at the cost of wrist comfort. Start with an EZ-bar unless you have great wrist mobility.
For muscle building, do 3 sets of 10-12 reps with 60 seconds rest. Use slow eccentrics (3 seconds down) to maximize the stretch stimulus. For higher volume phases, try 3 sets of 12-15 reps. Avoid going below 8 reps — the stretched bottom position is risky with very heavy loads.
The Preacher Curl typically requires a ez bar, which most home gyms don't have. For a home-friendly alternative targeting the same muscles, check the variations section above.
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Related Content
Safety Notes
- Never fully lock out elbows under load.
- Control the weight throughout.
Related Training Guides
Workout Plans with This Exercise
Compare This Exercise
Preacher Curl vs Standing EZ Bar Curl
Preacher curls isolate the biceps with zero momentum by locking your arms against a pad, making them ideal for strict isolation and targeting the lower bicep near the elbow. Standing curls allow heavier weights and some body English, making them better for overall arm strength and progressive overload. For maximum bicep development, include both variations in your program: standing curls early in the workout when fresh for heavier loading, and preacher curls as a finisher for strict pump work.
Preacher Curl vs Concentration Curl
Concentration curls maximize mind-muscle connection and peak contraction, while preacher curls emphasize the stretched position with heavier loading. Both isolate the biceps effectively for different purposes.